mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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* © 2022 Paul M. Antoine
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* © 2021 Neil McKechnie
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* © 2021 Harald Barth
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* © 2021 Fred Decker
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* All rights reserved.
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*
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* This file is part of CommandStation-EX
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef FSH_h
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#define FSH_h
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/* This is an architecture support file to manage the differences
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* between the nano/uno.mega and the later nanoEvery, unoWifiRev2 etc
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*
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* IMPORTANT:
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* To maintain portability the main code should NOT contain ANY references
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* to the following:
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*
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* __FlashStringHelper Use FSH instead.
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* PROGMEM use FLASH instead
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* pgm_read_byte_near use GETFLASH instead.
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* pgm_read_word_near use GETFLASHW instead.
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*
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* Also:
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* HIGHFLASH - PROGMEM forced to end of link so needs far pointers.
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* GETHIGHFLASH,GETHIGHFLASHW to access them
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*
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*/
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#include <Arduino.h>
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#ifdef ARDUINO_ARCH_AVR
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// AVR devices have flash memory mapped differently
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// progmem can be accessed by _near functions or _far
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typedef __FlashStringHelper FSH;
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#define FLASH PROGMEM
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#define GETFLASH(addr) pgm_read_byte_near(addr)
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#define STRCPY_P strcpy_P
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#define STRCMP_P strcmp_P
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#define STRNCPY_P strncpy_P
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#define STRNCMP_P strncmp_P
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#define STRLEN_P strlen_P
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#if defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560)
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// AVR_MEGA memory deliberately placed at end of link may need _far functions
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#define HIGHFLASH __attribute__((section(".fini2")))
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#define GETFARPTR(data) pgm_get_far_address(data)
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#define GETHIGHFLASH(data,offset) pgm_read_byte_far(GETFARPTR(data)+offset)
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#define GETHIGHFLASHW(data,offset) pgm_read_word_far(GETFARPTR(data)+offset)
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#else
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// AVR_UNO/NANO runtime does not support _far functions so just use _near equivalent
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// as there is no progmem above 32kb anyway.
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#define HIGHFLASH PROGMEM
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#define GETFARPTR(data) ((uint32_t)(data))
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#define GETHIGHFLASH(data,offset) pgm_read_byte_near(GETFARPTR(data)+(offset))
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#define GETHIGHFLASHW(data,offset) pgm_read_word_near(GETFARPTR(data)+(offset))
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#endif
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#else
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// Non-AVR Flat-memory devices have no need of this support so can be remapped to normal memory access
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#ifdef F
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#undef F
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#endif
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#ifdef FLASH
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#undef FLASH
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#endif
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#define F(str) (str)
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typedef char FSH;
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#define FLASH
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#define HIGHFLASH
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#define GETFARPTR(data) ((uint32_t)(data))
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#define GETFLASH(addr) (*(const byte *)(addr))
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#define GETHIGHFLASH(data,offset) (*(const byte *)(GETFARPTR(data)+offset))
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#define GETHIGHFLASHW(data,offset) (*(const uint16_t *)(GETFARPTR(data)+offset))
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#define STRCPY_P strcpy
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#define STRCMP_P strcmp
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#define STRNCPY_P strncpy
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#define STRNCMP_P strncmp
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#define STRLEN_P strlen
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#endif
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#endif
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